1.Mechanical excavator tolerance zone from utility marks:
1.机械挖掘机与公共设施标记的容差范围：
2.Before crane operations contractors must:
2.起重机作业前，承包商必须：
3.What\'s the main risk of welding in a small enclosed area?
3.在狭小密闭空间内进行焊接的主要危险是什么？
4.What\'s the largest allowed space between a scaffold platform and the building?
4.脚手架平台与建筑物之间的最大间隙是：
5.What safety measure is needed when unloading lumber from a truck parked on the street?
5.从停在路边的卡车卸木材时，需要采取哪些安全措施？
6.Prevalent asbestos type in roofing:
6.屋顶常见的石棉类型：
7.What is the minimum openable area required for an egress window?
7.逃生窗要求的最小可开启面积是多少？
8.Remove grout haze from tiles:
8.去除瓷砖上的水泥浆应：
9.Minimum egress doors for a single home:
9.单户住宅的最少逃生门数量为：
10.First contact for a work fatality:
10.工作中发生死亡事故的第一联络方是：
